Exactly. I'm now evaluating whether it's simpler/cheaper to
change the stock SC front heat exchanger for a 3.2 style one
change the oil lines running from the engine to the stock SC heat exchanger
add a second oil heat exchanger to be extra safe and ready for the day when I upgrade the engine

It was probably a decision based on cost...
I have to say that in normal operation oil temperatures are perfectly fine. Yesterday, however, was quite hot and track driving put a thermal stress far beyond what I can achieve when driving fast on a public road!
I have been looking at Elephant Racing finned oil lines. They are made out of brass which is a good thermal conductor. About 5 metres of finned oil lines exposed to airflow (I don't have rocker panels) could be a nice radiator in itself Has anyone around here tried them?

Thanks for all the comments. Later today, I'll check whether the front radiator gets hot.
Something that I didn't mention and might be relevant is that when I bought the car the oil lines had been replaced with rubber hoses with external metal braiding. Although I removed the rocker panels (which should improve line cooling), I think that the rubber lines might less energy dissipation than the originals...
Not sure if it's useful but in normal motorway traffic the oil temp gauge was below 9 o'clock although I guess that in this case all the energy dumping could be handled by the engine mounted cooler alone?

I did a trackday with my SC today with temps just south of 30 C and after a few hot laps the oil temperature was reaching the red line.
I have the conventional SC front oil radiator:
Would the Carrera 3.2 radiator be a significant improvement?

The problem with losses that is stated in the article can be avoided by asking for wheel horsepower.
But there are other corrections that are sometimes applied such as atmospheric pressure, temperature...

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